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TECHNICAL PAPERS

Application of Ice Particles for Precision Cleaning of Sensitive Surfaces

[+] Author and Article Information
D. V. Shishkin, E. S. Geskin, B. Goldenberg

Laboratory of Waterjet Technology, Mechanical Engineering Department, New Jersey Institute of Technology, Newark, NJ 07102

J. Electron. Packag 124(4), 355-361 (Dec 12, 2002) (7 pages) doi:10.1115/1.1511735 History: Received May 01, 2002; Online December 12, 2002
Copyright © 2002 by ASME
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References

Figures

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Photograph of the strip of the photo film. The photo emulsion was partially removed from the film surface. No surface damage was observed in the course of IJ. The feasibility of complete and selective emulsion removal from thin film was demonstrated. The feasibility of the use of an ice abrasive as an etching media was.
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Photograph of the magnification lens. The lens was contaminated by the lithium grease. The grease was partially removed from the lens surface. Notice that no damage of the lens surface was observed.
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Schematic of auger type IJ system: 1—evaporator, 2—refrigerant coils, 3—insulation, 4—auger, 5—ice reloading device, 6—air gun, 7—air supply port, 8—water supply port, 9—cooling media port, 10—gages, A—air flow rate valve, B—water flow rate valve, C—cooling media valve, and D—data acquisition card
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(a) Schematic, and (b) picture of the ice reloading device with nozzle block. Notice, the thermocouples are shown only for experimental needs.
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(a),(b) Size distribution of ice particles for refrigerant and liquid nitrogen cooling media as functions of the water flow rate and ice particles temperature
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(a),(b) Low and high density IAJ. Notice the homogeneous distribution of particle sizes in the stream.
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(a),(b) Photographs of electronics board of TV set and TV set in assembly. Notice the heavy layers of dust and dirt on the electric and electronic components of board. After cleaning, TV set worked normally.
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Photograph of the monitor board of PC Brook 486DX33. The monitor board was contaminated by the heavy layer of the mixture of lithium grease and copper powder and disabled. Then the board was decontaminated by IJ. The board performance was normal in assembly with PC. The feasibility of restoration of complicated electronic parts was demonstrated.
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(a) Photograph of the electronic board of the calculator containing electronic matrix. The electronic board was contaminated by the conductive powder. (b) Photograph of the electronic board of the calculator containing electronic matrix. The electronic board was contaminated by Rust-Oleum gloss protective enamel. (c) Photograph of the calculator cleaned by IJ in assembly. The assembled electronic calculator operated normally.
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(a) Photograph of the board of the electronic game containing electric conduits, microchip and electronic matrix. The board was covered by the mixture of the lithium grease and copper powder and disabled. Notice the cross contamination of electric conduits of the board. After cleaning the game performed normally. (b) Photographs of the electronic game in assembly after IJ cleaning. The electronic game performed normally.
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(a) Photograph of the DC motor. DC motor was disassembled and all elements were covered by the mixture of lithium grease and copper powder. DC motor was cleaned by IJ. In assembly DC motor performed normally; and (b) photograph of the electrical varistor. The varistor was contaminated by the mixture of the lithium grease and copper powder. Then the varistor was cleaned by IJ. After cleaning varistor worked normally. Notice the complicated geometry of the varistor surface. The feasibility of cleaning of complicated surfaces was demonstrated.
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(a) Photograph of the LC display of the calculator containing electronic matrix and LCD conduits. The display was contaminated by Rust-Oleum gloss protective enamel. Then all elements of LC display were decontaminated by IJ. In assembly of the calculator the LC display performed normally. (b) Photograph of the solar panel element of the calculator containing electronic matrix and conduits. The solar panel was contaminated by heavy layer of Rust–Oleum gloss protective enamel and then decontaminated by IJ. In the assembly of the calculator the solar panel performed normally. Notice that the semiconductor elements of the matrix are highly sensitive.
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Photograph of the CD-ROM covered by Rust-Oleum gloss protective enamel. The paint was partially removed from the CD ROM surface. No surface damage was observed in the course of IJ cleaning, and photograph of the CD-ROM partially cleaned by using of IJ technique. Notice that both layers of paint and emulsion were removed. No surface damage was observed in the course of IJ processing.

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